diff --git a/rflink/parser.py b/rflink/parser.py
index ffdad79..5ec416e 100644
--- a/rflink/parser.py
+++ b/rflink/parser.py
@@ -20,7 +20,7 @@
 CONTROL_COMMAND = '[A-Z]+(=[A-Z0-9]+)?'
 DATA = '[a-zA-Z0-9;=_]+'
 RESPONSES = 'OK'
-VERSION = '[0-9a-zA-Z\ \.-]+'
+VERSION = r'[0-9a-zA-Z\ \.-]+'
 
 # 10;NewKaku;0cac142;3;ON;
 PACKET_COMMAND = DELIM.join(['10', PROTOCOL, ADDRESS, BUTTON, COMMAND])
diff --git a/tests/test_cli.py b/tests/test_cli.py
index c4d52e8..31e9b3a 100644
--- a/tests/test_cli.py
+++ b/tests/test_cli.py
@@ -16,7 +16,11 @@ def stop():
         yield from asyncio.sleep(0.1)
         loop.stop()
     loop = asyncio.get_event_loop()
-    asyncio.async(stop(), loop=loop)
+    if hasattr(asyncio, 'ensure_future'):
+        ensure_future = asyncio.ensure_future
+    else:  # Deprecated since Python 3.4.4
+        ensure_future = getattr(asyncio, "async")
+    ensure_future(stop(), loop=loop)
 
     # use simulation interface
     args = ['--port', 'loop://', '-v']
diff --git a/tox.ini b/tox.ini
index 661cdfd..3fdc902 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py34,py35,lint,typing
+envlist = py34,py35,py36,py37,lint,typing
 skip_missing_interpreters = True
 
 [testenv]